Thank you for your attention. The other day I was stupid enough to delete by mistake the partition of a disk member of a RAID0 configuration created under MacOs. The deletion happened under Windows 10 though.
R-Studio is able to recognize that two disks were formerly part of a RAID0, but a lot of files are missing. I have performed a scan, which helped only a little.
The file types that were stored are of a kind not been looking for by default by the software, so I find myself in the need of specifying them.
In details, I need to recover files made with 3d Software like Maya, ZBrush, Substance Painter and so on.
I have files on other disks that I have used to extrapolate the headers and the footers, then under R-Studio I created a new category called "3d Data" in which I have specified all the file types I need. For each of them, I added a signature "Begin" and signature "End", typing in the format \xNN the hex code I got from my files.
After performing the scan, however, in "Extra Found Files" the category I created is not present, and only the default ones are. Before starting the scansion, I did specify to look for my category as well.
Where is the mistake in my procedure?

Sorry everybody, after the scansion, sorting the results by Extension, I was able to find my category and also the file types I specified.
So my question is solved, nevertheless if anybody feels to be able to contribute with some inputs concerning my situation, it would be very welcome!